content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.*;
  
  import ix.IxOrderedMergeArray.OrderedMergeIterator;
  
  /**
   * Merges an array of Iterable items by picking the smallest from them
   * with the help of a Comparator.
   *
   * @param <T> the value type
   */
  final class IxOrderedMergeIterable<T> extends Ix<T> {
  
      final Iterable<? extends Iterable<? extends T>> sources;
  
      final Comparator<? super T> comparator;
  
      IxOrderedMergeIterable(Iterable<? extends Iterable<? extends T>> sources, Comparator<? super T> comparator) {
          this.sources = sources;
          this.comparator = comparator;
      }
  
      @Override
      public Iterator<T> iterator() {
          @SuppressWarnings("unchecked")
          Iterator<? extends T>[] srcs = new Iterator[8];
          int n = 0;
  
          for (Iterable<? extends T> iter : sources) {
              if (n == srcs.length) {
                  srcs = Arrays.copyOf(srcs, n + (n >> 2));
              }
              srcs[n++] = iter.iterator();
          }
  
          return new OrderedMergeIterator<T>(srcs, n, comparator);
      }
  }
  